Ammonium Paratungstate with High Purity Prepared by Ultrasonic-Microwave-Hydrothermal-Synergism-Enhanced Method

Equipment requirements: crystallizer with microwave oven which includes door with button and furnace body. Magnetic stirrer, microwave generator and fault detection module are set in the oven; a tray set in inner cavity of the oven, place the three flasks up on the sensor; A sensor on the side wall of the inner cavity connect to temperature sensor; the ultrasonic generator and two glasses tube are arranged on the top of the oven, and the upper end of ultrasonic generator connects water inlet and outlet pipe, the lower end connect probe made by titanium alloy; both of the probe and temperature sensor are fixed in the inner of three flasks, the lower end of two glasses tube connected with a side port of three flasks, the relay connect with ultrasonic and microwave generator, and temperature and press sensor connected with relay trough transmitter; one side of fault detection module connect to microwave generator, and the other connect to relay.


The specific steps of ammonium paratungstate with high purity prepared by Ultrasonic-Microwave-Hydrothermal-Synergism-Enhanced method are like follows:
1. Place ammonium tungstate with concentration of WO3 not less than 220 g/L in a three flasks and turn on magnetic stirrer, keep the stirring speed in 70-300rpm;
2. Turn on microwave and ultrasonic generator, power of both are controlled at 1-3KW, set microwave frequency among 0.5-1.5Hz and ultrasonic frequency 100-200KHZ, heating the solution;
3. Turn on the camera and temperature sensor;
4. Control temperature above 80℃, because solution began to crystallization when temperature reached 80℃;
5. The crystallization end for rate of 65%, then the pure APT crystal can be made.

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